PYQ Vault

Day 206: CBSE Class 10 Science

5 questions (8 parts). Try each one first, then open its answer.

  1. Question 1

    Light — Reflection and Refraction. Asked once: 2024 (same type asked 4 times)

    11
    How will the image formed by a convex lens be affected, if the upper half of the lens is wrapped with a black paper ?

    Tap an option to check your answer.

  2. Question 2

    Light — Reflection and Refraction. Asked once: 2023 (same type asked 4 times)

    25 OR
    (a) A ray of light starting from diamond is incident on the interface separating diamond and water. Draw a labelled ray diagram to show the refraction of light in this case. (b) Absolute refractive indices of diamond and water are 2.42 and 1.33 respectively. Find the value of refractive index of water w.r.t. diamond.

  3. Question 3 (case study, 4 parts)

    Magnetic Effects of Electric Current. Asked once: 2022 (same type asked 4 times)

    A student was asked to perform an experiment to study the force on a current carrying conductor in a magnetic field. He took a small aluminum rod AB, a strong horse shoe magnet, some connecting wires, a battery and a switch and connected them as shown. He observed that on passing current, the rod gets displaced. On reversing the direction of current, the direction of displacement also gets reversed. On the basis of your understanding of this phenomenon, answer the following questions :
    15 (a)
    Why does the rod get displaced on passing current through it ?
    15 (b)
    State the rule that determines the direction of the force on the conductor AB.
    15 (c)
    (i) If the U shaped magnet is held vertically and the aluminum rod is suspended horizontally with its end B towards due north, then on passing current through the rod from B to A as shown, in which direction will the rod be displaced ? (ii) Name any two devices that use current carrying conductors and magnetic field.
    15 (c) OR
    Draw the pattern of magnetic field lines produced around a current carrying straight conductor held vertically on a horizontal cardboard. Indicate the direction of the field lines as well as the direction of current flowing through the conductor.

  4. Question 4

    Metals and Non-metals. Asked once: 2024 (same type asked 4 times)

    28
    Suggest an activity to differentiate between the chemical properties (acidic or basic character) of the product obtained on burning a metal (magnesium) and a non-metal (sulphur).

  5. Question 5

    Metals and Non-metals. Asked once: 2024 (same type asked 4 times)

    28 (a)
    State giving reason the reduction process to obtain the following metals from their compounds : (i) Mercury, (ii) Copper and (iii) Sodium